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i2c-pasemi: Fix NACK detection

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Turns out we don't actually check the status to see if there was a
device out there to talk to, just if we had a timeout when doing so.

Add the proper check, so we don't falsly think there are devices
on the bus that are not there, etc.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Olof Johansson 2007-11-15 19:24:02 +01:00 committed by Jean Delvare
parent ff23f3eabb
commit be8a1f7cd4
1 changed files with 5 additions and 0 deletions
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5
drivers/i2c/busses/i2c-pasemi.c
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@ -51,6 +51,7 @@ struct pasemi_smbus {
#define MRXFIFO_DATA_M 0x000000ff
#define SMSTA_XEN 0x08000000
#define SMSTA_MTN 0x00200000
#define CTL_MRR 0x00000400
#define CTL_MTR 0x00000200
@ -98,6 +99,10 @@ static unsigned int pasemi_smb_waitready(struct pasemi_smbus *smbus)
status = reg_read(smbus, REG_SMSTA);
}
/* Got NACK? */
if (status & SMSTA_MTN)
return -ENXIO;
if (timeout < 0) {
dev_warn(&smbus->dev->dev, "Timeout, status 0x%08x\n", status);
reg_write(smbus, REG_SMSTA, status);